Kent County Public Schools

1. In Finder, press the key 'option' and click on 'Library' under 'Go'.
2. In library folder, scroll down to 'keychain'.
3. Click on the arrow to the left of keychain to reveal what's under it.
4. Delete everything under keychain, but not the keychain folder itself. (In my case, I had to delete 3-4 files and a folder).
5. Restart the mac.
6. Voila, you are done. No more annoying pop-ups.